Improvement in steam-valves



UNITED STATES V PATENT OFFICEG `M. BURNETT AND H. OOMSTOGK,

or BoSToN, MASSACHUSETTS.

IMPROVEMENT IN STEAM-VALVES.

To all whom it may concern: i I Be it known that We, M. BURNETT and H. GoMsTocK, both of Boston, in the county of Suolk and State of Massachusetts, have invented a new and useful Improvement in Valves; 'and We do hereby declare that the following, taken in' connection With the drawings which accompany and form part of this fsliieciiication, is a description of our invention suflicient to enable those skilled in the art to practice it.

Our. invention relates to that class of apcrl ture-controlling devices in which a valve is moved toward, upon, and ott' from a valve-seat as contradistinguished from that class of devices in which, like a plug-cock, the aperture is opened and closed by the sliding or moving of one part upon the other.

Our invention consists in a valve-seat of soft yielding material, such as vulcanized rubber preferably, soft metal, -wood, or other suitable substance in the form of a ring or short cylinder, when made changeable by being embedded in a suitable cylindrical receptacle formed in the material ofthe valve-case, with a portion of the ring projecting above the surrounding metal of the case and operating in combination with the valve. p

The object of this invention is to secure a stop-valve which can be kept at all times in such condition as to be tightly closed without necessity of having recourse to the tools or services of a mechanician by the simple operation of changing a Worn seat for a new one.

In the drawings, A represents, partly in section and partly in elevation, anordiuary globevalve so modified as to embrace out` invention. B shows the valve in plan, and C is a plan of the seat located in a circular groove formed in the metal of the valvecase. y

In the metal of the valve-case a groove is turned, into which can be driven the seat a, this being formed of suitable size to tit the groove. Where the scat a is of vulcanized rubber We prefer to form the groove in the metal a little the Widest at the bottom and to give the short cylinder or ring a a similar form of crosssection, so that when it is forced into place, which, under the circumstances, the elastic quality of the rubber permits, the seat is in a manner dovetailed in its place. The upper surface of seat We prefer to make convex, as shown in the drawing marked A, and to give the bearingsurface of the valve b a. corresponding annular conca-vity.

VVhene'ver from any circumstances the 1naterial ofthe valve-seat becomes changed from chemical causes, as often occurs in the use ot' rubber, or becomes Worn or abraded, it can, by reason of its projecting above the material in which it is held, be seized and removed and a new and perfect seat substituted therefor.

We claim- As an improvement in stop-valves, the arrangement of the seat a and valve b, when constructed Substantially as described.

MARSHALL BURNETT. HARRISON GOMSI'IOGK.

Witnesses:

F. GoULD, J. B. CROSBY. 

